| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve downsizing and low cost by reducing the number of components and simplifying a circuit configuration. <P>SOLUTION: A switching power-supply device comprises: a rectifier circuit 1 rectifying an AC input voltage Vac; input capacitors 2 and 3; an inductor 4; an NMOS 5 on/off-operating by a control signal S1; an NMOS 6 on/off-operating by a control signal S2; an LLC resonant circuit 10; rectifier smoothing circuits 15 and 16; and control section 20 generating the control signals S1 and S2 on the basis of a voltage V3 of a node ND2 and a DC output voltage Vo. The switching power-supply device switches the NMOSs 5 and 6 by using the common control section 20 and performs frequency control for the LLC resonant circuit 10 and PWM control for a PFC. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
